Siobhan Freegard, of parenting site Netmums, said: "Anyone taking a baby to a rave is raving mad. A four-month-old needs calm, not booming music, strobe lights and rowdy partygoers. If you want to go out, get a babysitter."

But Hulme insisted that she had done nothing wrong and would never endanger her son's life.

"My daughter Kerry was performing with her band in her home town for the first time and I wanted to be there," she told the Sun.

"What's wrong with that? I don't think I've been irresponsible at all."

According to Hulme, she decided to take the baby as it was more convenient and insists that he slept through the performance. She claimed that officers searched her for drugs on the way into the event but made no comments about her son.

"I breast-feed him so he has to be with me. In France or Spain, parents are encouraged to take their kids to music festivals."

A Dyfed-Powys Police spokesman said: "Following close liaison with social services, Dyfed-Powys Police has been made aware of an incident involving child protection issues and will be monitoring and evaluating this incident."